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SHARE-BASED COMPENSATION - Share Option Award Plan (Details)
 12 Months Ended
Dec. 31, 2021
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Share-Based Payment Arrangements [Abstract]    
Outstanding, beginning of the period (in shares) | shares 4,700,000 7,500,000
Granted (in shares) | shares 1,100,000 0
Exercised (in shares) | shares (200,000) (1,800,000)
Forfeited (in shares) | shares (100,000) 0
Expired (in shares) | shares (400,000) (1,000,000.0)
Outstanding, end of the period (in shares) | shares 5,119,591 4,700,000
Exercisable, end of the period (in shares) | shares 2,600,000 2,300,000
Outstanding, beginning of the period (C$ per share) $ 4.91 $ 5.11
Granted (C$ per share) 3.94 0
Exercised (C$ per share) 3.12 4.02
Forfeited (C$ per share) 4.84 0
Expired (C$ per share) 4.38 7.72
Outstanding, end of the period (C$ per share) 4.82 4.91
Exercisable, end of the period (C$ per share) $ 4.88 $ 4.59
Closing foreign exchange rate (C$ per share) 0.7901